Rotary blower or compressor



.Sept. 21 ,192 1,600,690

A. MEYER ROTARY BLOWER 0R COMPRESSOR Filed June 7 1926 i an improved struction.

Patented Sept 21, 1926.

. 1,600,690 PATENT OFFICE.

ADOLF MEYER, OF KUSNACHT,1\TEA R ZU 'RICH, SWITZERLAND, ASSIGNORTO AKTIEN- GESELLSCHAFT BROWN BOVERI 6'0 CIE., OF BADEN, SWITZERLAND, A JOINT STOCK QOMPANY OF' SWITZERLAND.

I ROTARY BLOWER 0R COMPRESSOR.

Application filed June 7, 1926, Serial No. 114,065, and in Germany May 2, 1925.

This invention relates to the construction of rotary blowers orcompressors of the type operating on the centrifugal or centripetal principles. 1

The general purpose of the invention 1s the provision of a Construction which Wlll contribute to the operation of such ma chines at increased efliciencies, and which Wlll contribute to economy in cost' through reduction of the amount of material requisite in the rotating members and associated parts.

A particular object of the invention is the provision of a construction which Wlll .permit alreduction in the amount of material requisite in the shroud discs for sustaining high speed operation.

Another specific object of the invention is the provision of a construction which will afford a very secure connection between the shroud discs through the medium of the blades. Another general object is the provisionoof a construction which will increase the factor of. safety in such machines. A further object is the provision of a construction which will facilitate manufacture and assembly.

Another object is the provision of a construction which will contribute to conservation inthe amount of space requisite for the various parts of the machine and the machine as a whole. 7

An additional object is the provision of and advantageous blade con Other and further objects will be pointed out or indicated hereinafter or will beiapparent to one skilled in the art upon an understanding of the invention In the accompanying drawing forming a -part of this specification, I illustrate certain fashions in which the inventionmay be embodied, but it is to be understood that the invention as claimed 'is'not limited to these particular forms. In the drawings, V Fig. 1 is a part sectional elevational view of a wheel construction for a rotary compressor of the centrifugal type, the section being taken 'on a radius of the wheel;

Fig. 2 isa detail in the nature of a part section of awheel taken in a plane transverse of its axis and showing one of the blades in side elevation;

Fig. 3 is an enlarged detail illustrating an end portion of a blade in longitudinal section, and

Fig. 4 is a detail showing in perspective a port on or section of a blade part.

' im tations are imposed upon the speed at whlch the rotary parts of rotary com pre'ssors may be operated, by the stresses "imposed on the discs, the blades and'blade mountings. A-hi'gh peripheral speed with wheels of substantial diameter necessitates comparatively thick blades, the weight of which owing to centrifugal action and air pressures, sensibly affects the side discs and, to a degree, the shaft and shaft bearings. Considerations of design and critical speed limit the length of the shafts, with the result that increase in the thickness of the discs to carry heavy blades may undesirably llmit the number of wheels which may be mounted on a shaft.

The present invention is designed to permit a desirable lightening of the discs, and at the same time permit operation at high peripheral speeds, and is accomplished primarily through the use of a special blade construction which accomplishes not only a decrease in weight and resulting centrifugal 4 stresses, but forms a very strong and stable connection between the shroud discs forming a unitary wheel. The nature of the invention. will be most quickly ascertained by t reference to the illustrative forms shown."

rotated. These discs are spaced apart and.

connected by blades 12 extending in gener ally involute directiom The construction of the blades constitutes a feature of the invention. The principal member of the blade structure ,is a body portion 12 which may be formed as a casting or pressing of strong metal, presenting a wall of the proper width with upstanding transverse rib 12 on one side. Portions of the material at the ends of the ribs are prolonged beyond the margins of the wall portion to form attaching rivets 12. The body member may be formed integrally throughout the length of the blade or subdivided into a plurality of blade sections. A wall portion 12 is provided over the tops the ribs and to the end portions ofthe oi the ribs 12", said wall portion being of the same width as the wall portion 12. The wall portion 12 may be formed'of sheet metal securely attached to the tops gt 3 member by electrical welding, as illustrated in Fig. 3. The blade construction. thus affords a. hollow structure of relatively light weight in comparison to a solid structure of equal size. The blades are mounted between the shroud discs and 11 by in serting the rivets through holes drilled in the discs and upsetting the ends of the rivets at the outer; faces of the discs. Thus the discs are bound tightly against the margins of thebody portion and the end portions of the ribs about the rivets, the

lades thus forming spacers and strong connecting mountings for the discs. Some of the most serious bending moments to which the blades of rotary compressor wheels are resulting from centrifugal-force in the operation of the wheel, and consequently upon the material in. the discs which su ports the rivets, thus permitting the lightening of the discs, with consequent saving ofv space on the shaft. The construction, in addition to possessing the desirable features of lightness and strength, afi'ords smooth outer wall surfaces which minimize age and 'fI'lCiZlOII.

The construction may bevaried' in parlosses from windticulars, such as by the addition of longi- .tudlnal ribs l4e-as illustrated inFig. 4, and

the cover wall 12 may be welded to the tops of these as well as to the transverse ribs, if

desired.

Q their margins contacting the faces .of the What I claim is:

1.' In a compressor wheel, the combination wlth side discs, of hollow blades with discs, and means securing the blades to the I discs.

2. In a compressor wheel, the combination with the wheel discs, of hollow blades between the discs, said. blades having transverse ribs contacting the inner faces of the discs, and means discs.

3. A compressor combination, discs, hollow bla es'between the discs and rivets extending from the margins of the blades and seated in the securing the blades to the discs to hold the latter incontact with the blade margins.

4;. A blade for rotary compressors comprising wall portions with intervening transversely extending ribs connecting the .wall portions in spaced relationship.

5. A blade for rotary compressors comto wheel, com rising, in.

prising wall portions with transversely extending ribs connecting the wall portions v in'spaced relationship and securing members at the ends of the ribs.

6.. Blade construction for rotary compresversely extending ribs connecting the wall portions in spaced relationship and rivets formed at the ends of the ribs. 1 i

sor wheels comprising wall portions, trans 7 .Bladeconstruction for rotary compressor wheels comprising a body portion formed with ribs projectingfrom one side, a cooperating wall portion secured to the tops of the ribs and marginal connecting means. I

8. Blade construction forrotary compressor wheels comprlsing a wall portion formed with transverse ribs and rivets projecting beyond the margins of the wall portion, and acooperating wall portion secured to the tops of the ribs.

9. 'A blade construction for rotary com- I pressor wheels comprising cooperating wall portions arranged in spaced relationship, spacing members between the wall ortions and secured thereto, and attaching'members projecting from the ends ,of the spacing members.

In testimony'whereoi ,I have hereunto subscribed my name at Camden, N. J., on the3rd day of June A. D. 1926.

- ADOLF'MEYER.

DISOL AIMER V 1,600,690.Adolf Meyer, K nacht, 'near Zurich, Switzerland. ROTARY BLOWER; on

COMPRESSOR. Patent dated September 21, 1926. Disclaimer filed March 26, 1932, by the assignee, Aktienfiesellschaft' Brown Bover'i & Cole.

.Hereby enters this disclaimer to. claims 2, 4, 7 and 9 of the said Letters Patent,

to, wit:

2. In a compressor wheel, the combination the wheel discs, of hollow blades I between the discs, said blades havmg transverse ribs contacting the inner faces of.

the discs, and means secnring the blades to the discs. I I

"4. A blade for rotary compressors comprising wall portions w1th mtervemng transversely extending ribs connecting the wall portions n spaced relationship.

.7. Blade construction for rot'ary compressor wheels comprising a body portion formed with ribs projecting from one side, a cooperating wall portion secured to the 1 tops of the ribs and'marginal connecting means 9. A blade construction for rotary compressor Wheels comprising cooperating portions arranged in spaced relationship, spacing members between the wall portions v and stecured thereto, and attaching members projecting from the ends of the spacing mem ers. I t

[Oflicial Gazette April 19,41 932] 

